Hydrocarbon stove



Sept. 19, 1939. c. w. MUMMERY HYDROCARBON STOVE Filed Aug. 25, 1936 4Sheets-Sheet 1 -INVENTOR.

6.4 701:" 14/ WON/75?) hy/W ATTORNEY.

Sept. 19, 1939. c. w. MUMMERY HYDROCARBON STOVE Filed Aug. 25, 1936Sheets-Sheet 2 nw RN INVENTOR.

CZ, 705 V/ Nam/7:767 BY ATTORNEY.

Sept. 19, 1939. c. w. MUMMERY HYDROCARBON STOVE Filed Aug. 25, 1936 4Sheets-Sheet 3 k ww wm g Q f k 1 t N Ma wk 3 xv 3% v w 7 v Q Sept. 19,1939. c w MUMMERY 2,173,522

HYDROCARBON STOVE Filed Aug. 25, 1936 4 Sheets-Sheet 4 INVENTOR. 61 705M HUM 9K6) ATTORNEY.

Patented Sept. 19, 1939 UNITED STATES PATENT OFFICE HYDROGARBON STOVEApplication August 25, 1936, Serial No. 97,798

4 Claims.

This invention relates to new and useful improvements in stovesconsuming hydrocarbon fuel and more particularly to the type in whichthe fuel is forced to the burner under pressure from a remote fuel tank.

An important object of the invention is to provide an automatic valve onthe stove whereby the fuel tank can be located at a distance from astove and obviate the necessity of manipulating tank valves to operatethe stove.

Another important object of the invention is to provide an arrangementof the above character which prevents flooding of the manifold andburners when the latter are accidentally extinguished.

A further object of the invention is to provide an arrangement whichwill provide for instant lighting of the burners when cold.

More generally the invention provides for the operation of the stove andburners from in front thereof and precludes the necessity of moving fromthe tank to the stove to operate the same; thus making provision for thelocation of the fuel tank outside of the building without necessitatingthe operator running to and from the tank to operate the burners.

Other objects and advantages of the invention will become apparentduring the course of the following description.

In the accompanying drawings forming a part of the application andwherein like numerals are employed to designate like parts throughoutthe several views,

Fig. 1 is a top plan of the device as applied to the four open burnersof a range type stove, this view being partially diagrammatic to showthe fuel lines from the storage tank,

Fig. 2 is an enlarged side elevation of the generator, burner andautomatic valve assembly,

Fig. 3 is a front elevation thereof partially in section,

Fig. 4 is an enlarged detail of the distributing chamber for thegenerating and associated burners,

Fig. 5 is an enlarged longitudinal section of the automatic valve,

Fig. 6 is an enlarged longitudinal section of the generator tube,

Fig. '7 is a side elevation of the pressure fuel tank,

Fig. 8 is a top plan of the same.

Referring more particularly to the drawings and to Figs. 7 and 8, thenumeral l0 designates a pressure fuel tank, adapted in the presentembodiment, to hold liquid gasoline with a head of compressed airthereabove furnished to the tank through a valve fitting II by means ofany form of pump l2. This tank is preferably located outside of abuilding. When the desired pressure of air within the tank is obtained,the 5. valve in Fig. 11 may be closed to trap a head of air. A liquidfuel gauge I3 of the float type may be associated with the tank and afiller tube I5 is essential for replenishing the supply of gasolinewithin the tank; a closure cap being provided therefor. A valve fittingl6 extends through the top of the tank l0 and has a pipe line I! leadingtherefrom to the automatic valve to be presently described. When thevalve associated with this fitting is opened, air under pressure passesthrough the pipe ll as is obvious. A similar valve fitting I8 is alsofitted in the top of the tank and has a pipe l9 leading therefrom to theautomatic valve. Extending from this fitting I8 is a vertical liquidfuel pipe 20 terminating adjacent the bottom of the tank, in'a suitablescreening or filtering means 2!. Air under pressure in the top of thetank forces the liquid fuel up through the tube 20 and thence throughthe pipe l9 to the automatic valve whenever the hand valve associatedwith the fitting I8 is opened. Since the automatic valve on the stove isprovided with a hand valve for controlling the How of both air andgasoline to the generating tube, the valves in the fittings I6 and I8 onthe liquid fuel tank may remain open at all times.

The fuel supply tank is diagrammatically indicated in" Fig. 1 so thatthe co'nnecti'onof the pipe lines'from the tank to the automatic valve22 shown in Fig. 5, will be obvious. The air pipe I! is attached tonipple 23 of the automatic valve while the gasoline line It is coupledwith a nipple 24, both of which are screwed into one end of theautomatic valve casing 25. This valve casing is also provided with alateral nipple 26 for the connection of one end of a conduit 2'! forconveying a. combustible mixture from the automatic valve to thegenerator tube 28 arranged above a generating burner 29. When this mainburner 29 is lighted, the vaporized fuel fro-m the generator 28 passesinto a carburetor 30 sucking in atmospheric air as it passes the lowerport 3!, after which this mixture passes on to a mixing and distributingchamber 32 such as disclosed in my former United States Patent No.1,827,951. The lower portion of this distributing chamber is connectedwith a straight manifold 33 having several branches 3! each controlledby a valve 35 having a stem extending through the manifold anda'suitably packed joint to the 55 front of the stove with which theburners are associated to terminate in. a readily accessible valveoperating handle H. Each valve has a separate handle M as will beobvious. Each branch 34 leads to a riser 31 of an open range type burnerB.

The center of the manifold 33 is provided with a branch pipe 38 leadingto an oven burner 39 arranged inside of an oven diagrammaticallyillustrated by the numeral 40 in Fig. 1. A valve 4| is provided for thebranch 38 and has a valve stem 42 extending through a packed joint inthe manifold forwardly to terminate in a handle I-I' locatedadjacent'the front of the stove in convenient position for the cook tooperate.

As best appreciated from Fig. 3, the manifold 33 inclines downwardlytoward one side of the stove so that any liquid fuel or products ofcondensation will drain toward the end 2| of the manifold so as to bereadily removed therefrom through pet cock 42.

Also leading from the distributing chamber 32, but forwardly thereoftoward the main burner 29, is a conduit 43 which leads into a secondarydistributing chamber 44 by which the combustible vapor is conveyed atall times through port 45 into the central arm or chamber 46 formedintegral with the somewhat circular portion of the main burner 26.However, this central arm 46 has its passage blocked out from thepassage through the circular portion of the main burner, and for thesake of clarity, will designate this central arm as the finger orgenerating burner 46.

The secondary distributing chamber 44 has a lateral branch partitionedoff with partition 48 into a separate valve chamber 49 which may beclosed off completely from the distributing chamber by a valve 50 havinga .valve stem 5| extending forwardly of the stove to be as readilyaccessible as the other valve handles. This valve chamber is providedwith a port 52 which leads into the passage through the circular burner29 to supply the same with combustible mixture whenever the valve 50 isopened. This provides an arrangement whereby only the finger burner 46may be lighted to the exclusion of the main cooking burner 29, or whenthis latter is desired, the valve 5!! may be simply opened to permitpart of the combustible mixture to go through the port 52 and port 45 sothat both the finger and the main burners burn simultaneously.

Referring now more in detail to Fig. 5 of the drawings illustrating theautomatic valve, it will be noted that the fitting 23 terminates at'itsinner end by a yieldable or resilient valve seat 55 with which the airvalve body 56 having a conical operative end, cooperates. If desired theyieldable material may be placed on the valve. When this air valve 55 isseated, air under pressure from the fuel tank to the generator is cutoff. This valve 56 terminates at its other end in a reduced threadedextension 5'! which extends through a central perforation in a hardenedbrass diaphragm 58. This diaphragm at its periphery is clamped betweenthe automatic valve housing 25 and a removable packing nut 59. Aclamping head 66 is threaded on the end 51 of the valve bodysufiiciently far to clamp against the diaphragm and so that the valvestem 6! having a threaded socket at its inner end may also be screwedupon the reduced portion of the valve. A compression coiled spring 62bears against the head 60 and one end of the plug 59 so as to normallyurge the valve 56 upon its seat to out off air under pressure from thesupply tank. The normal position of this valve, however, is open and offof its seat; it being held thus against the compression of spring 62 bya thermostatic control to be presently described.

The diaphragm 5B constitutes one wall of a chamber 63 which has adiagonal port 64 leading into a fuel atomizing chamber 65, in adirection diagonal of the flow of incoming atomized liquid gasolinewhich is forced through the nipple fitting 24 by the air under pressurefrom the fuel supply tank. Between this atomizing chamber 65 and thenipple 26 which leads to the generator, the automatic valve housing isprovided with a valve seat 66 upon which a needle valve 61 may come torest for completely shutting off the flow of fuel to the generator. Thisneedle valve 61 is in the form of a stem 68 having an abutment 69thereon for engagement with one end of a packing gland ill to limit thefully opened position of the needle valve. This stem extends on throughthis packing gland 10 to terminate in a handleG adjacent the front ofthe stove and directly in front of the primary burner 29. Directly abovethis valve operating handle G is disposed the operating handle M of theneedle valve associated with the generator tube which will be presentlydescribed.

The inner end of a needle valve 61 is twice reduced as at H and again at12 to form an atomizing effect with a restricted inner bore of thenipple fitting 24 which admits gasoline to the automatic valve. With thegasoline valve of the tank open and a head of air in this tank, rawgasoline will be forced through the nipple 24 and past the atomizingneedle 12 into chamber 65 to be somewhat atomized, by the air underpressure from the nipple 23 passing valve 26 and through the port 64, tothoroughly atomize the fuel and cause its existence in chamber 65 in theform of a fog which passes on out to the generator 28 when the valve 66is manually opened. The automatic valve casing is suitably supported ona bracket 13 depending as. an integral part of the main burner casting.

The air valve 56 is normally held open against the compression of spring62 by means of a valve stem 6| being connected to a thermostatic rod 14which when heated expands and, relaxes tension on the air valve stem SIand permits the air valve 56 to seat under the expansion of coil spring62 so as to automatically out off air under pressure from the fuel tank.This thermostat I4 is supported immediately to one side of the generator28 and above the finger burner 46. One end of the thermostatic rod isrigidly mounted in an upstanding lug 15 cast integral with the mainburner 29, while the opposite end of the thermostatic rod passes throughthe upper end of a lever 16 fulcrumed as at H upon a forwardly extendinglug 18 cast upon the forward side of the main burner 29. The movable endof this thermostatic rod 16 is provided with a pair of nuts so that therelationship of a thermostat and valve may be varied at will. The outputend of lever 16 is forked to straddle air valve stem BI and slidesfreely thereon when the thermostat expands and releases the lever 16. Apair of lock nuts 19 are threaded upon the outer end of valve stem 6| toform an abutment for the lever so that upon contraction of thethermostat 14 the lever is moved clockwise to lift the valve 66 from itsseat against the tension of valve spring 62.

The generator 28 for vaporizing the fuel consists of an elongated tubeas usual arranged above the finger burner 46 and is provided with alateral nipple 80 to receive the fuel mixture from the automatic valvethrough pipe 21. The inner end of the generator tube is reduced andrigidly secured in the forward end of the carburetor 30 and is thereprovided with an atomizing nozzle 8| which is reamed out to provide amix ing chamber 82. The generator tube proper is provided with anintegral valve seat 83, upon which seats a needle valve 84, which isclosed when the generator is not operating. This needle valve 84 hasthreaded connection with the generator tube as at 85 and continues onthrough the tube and beyond the same in the form of a valve stem 86terminating in a handle beyond the packing gland 81 for the generator M.

Assuming that the stove is not in operation and it is desired to lightthe burners thereof, the fuel tank is pumped up to provide a head of.air therein and the valve fittings l and I8 are opened permitting thecompressed air in the tank to force the liquid fuel up through the tube26 and thence through pipe line I9 to the automatic valve. Assuming thatthe thermostatic rod 14 is contracted, the air valve 56 in the automaticvalve will be open permitting air under pressure to pass from the tankthrough the pipe I! into chamber 63 thence through port 64 to bedirected against the atomized gasoline entering chamber 65. The needlevalve 61 is then opened permitting the atomized fuel to pass throughpipe 21 into the generator tube at 80 and thence through the same, inthe form of a fog, past valve seat 83 into the carburetor 36 and thenceinto the distributing chamber. From here, the fog passes through branch43, port 45 into the finger burner 46 from which the fog is emitted andcan be immediately ignited by striking a match thereto. The flame fromthis finger burner 46 heats the generator and vaporizes the fuel passingthrough the generator. As the heat from the finger burner is continued,it causes the thermostatic rod 14 to expand gradually thereby releasingcompression on the spring 62 of the automatic valve until such time asthe thermostat is expanded sufiiciently to permit the air valve 56 toseat upon its seat 55 and thereby cut off air under pressure from thefuel supply tank. From this time on in the operation of the stove, onlygasoline passes through the automatic valve to the generating tube whereit is sufficiently vaporized to combine with the air drawn in throughthe carburetor 30 to form an efficient fuel which can then pass from.the distributor 32 to all burners which can be ignited by simply openingtheir respective valves. Should all of the burners be accidentallyextinguished, the thermostat will contract, thereby opening air valve 56permitting the air under pressure in the tank to be exhausted therefromwhich will automatically stop the flow of gasoline from the fuel supplytank to the burners. Under these conditions after the air valve is openfor a short interval of time, the supply of air under pressure in thefuel tank will become completely exhausted so that only a fewtablespoons of raw gasoline escape into the manifold while the burnersare turned on and this accumulation can be readily drained through thepet cook 42.

It will be understood that various changes in the size, shape andarrangement of parts may be resorted to without departing from thespirit of the invention or the scope of the appended claims.

I claim:

1. In a gasoline pressure stove, a pressure fuel tank, a generator, agenerator burner, an automatic valve in proximity thereto having anormally open spring closed air valve and stem and a manuallycontrollable fuel valve, a thermostatic rod having one end fixed to therear of said generator burner, a lever fulcrumed on the front of saidburner, the other end of the rod sliding through a long end of thelever, and the other shorter end of said lever having a slidingconnection with the valve stem whereby expansion of the rod permits theair valve to automatically close.

2. In a gasoline pressure stove, a generator, a generator burner, anautomatic valve located in proximity to the burner and having an airchamber, said valve also having an air port communicating With saidchamber .and a manually controllable liquid fuel valve, an air portextending from said air chamber to the liquid fuel valve, a diaphragm insaid air chamber, a normally open .air valve connected with saiddiaphragm, a valve rod connected to said diaphragm, a spring associatedwith said rod and normally urging the air valve toward its seat, and athermostatic element operatively connected to said air valve stem forautomatically unloading the spring to close the valve upon expansion ofthe thermostatic element.

3. In a gasoline pressure stove, a pressure fuel tank, a generator, agenerator burner, an automatic valve supported below said burner andhaving a normally open spring closed air valve and a stem with ashoulder, a manually controllable fuel valve, a thermostatic rodarranged above the burner and having one end fixed to the rear of saidgenerator burner and an abutment on the other end of said rod, a leverhaving long and short arms and fulcrumed on the front of said burner,the other end of the rod sliding through a short arm of the lever andthe abutment on said rod being adapted to engage said lever as the rodcontracts, and the other longer arm of said lever having a slidingconnection with the valve stem whereby expansion of the rod permits theair valve to automatically close, and said lever engaging said shoulderof the valve stem to open the valve as the thermostatic rod contracts.

4. In .a gasoline pressure stove, a generator, a generator burner, anautomatic valve located in proximity to the burner and having an airchamber, said Valve also having an air port communicating with saidchamber and a manually controllable liquid fuel valve, an air portextending from said air chamber to said liquid fuel valve, a recessedpacking nut screwed into said chamber, a valve rod slidable through saidnut, a diaphragm held in said chamber by said nut, an enlarged headslidable in said recess of the nut, a spring in said recess bearingagainst said head, a valve head having a reduced threaded extensionextending through the diaphragm, head and threaded into the end of thevalve rod, and a thermostatic element connected to the valve rod fornormally holding the valve head open against the tension of said spring.

CLYDE W. MUMMERY.

